Question

calculate
Molarity of 75g of MgCl2 dissolve in 500ml
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Answer 1

Answer:

1.56 mol kg−1

Explanation:

molality = number of moles of solute/ mass of solvent in kg

Mass of solvent = 500 g or 0.500 kg

number of moles of MgCl2

= mass of MgCI2

/ molar mass of MgCl2

number of moles of MgCl2

= 75 g / 95.2 g

mol−1

number of moles of Mg

CI2

= 0.78 moles

molality = 0.78moles / 0.5 kg

molality = 1.56 mol kg−1